Salinity and Juvenile Chum Salmon (Oncorhynchus keta): Effects on Liver Histomorphology, Non-specific Immune and Digestive Enzymes

doi:10.11924/j.issn.1000-6850.casb19030127

Abstract

Abstract:

The paper aims to study the effects of various salinities on liver histomorphology, non-specific immune and digestive enzymes activities in juvenile Chum salmon (Oncorhynchus keta). The Chum salmon was cultured in salinities 0‰, 8‰, 16‰ and 24‰ for 42 days,respectively, we measured the non-specific immune enzyme and digestive enzyme activities by using the liver and digestive tract, and observed the liver structure change under different salinities. The results showed that: the trend of superoxide dismutase, glutathione peroxidase and catalase activities in the liver of juvenile Chum salmon increased first and then decreased with the increase of salinity, but the enzyme activity peaks were different; the alkaline phosphatase activity increased first and then decreased with the increase of salinity, but different salinity treatment groups had no significant effects on acid phosphatase activity (P>0.05); different salinities had complicated effects on various digestive enzymes’ activities in the digestive tract and there was no overall effect between various digestive enzymes; histological observation showed that the liver structure of the salinity group 0‰, 8‰, and 16‰ was normal, while the salinity group 24‰ showed a certain degree of lesions. It is speculated that 8‰-16‰ is the optimal salinity for juvenile Chum salmon with the body weight about 1 g during the catadromous migration period.

Key words: chum salmon, catadromous migration, salinity, liver, non-specific immune enzyme, digestive enzyme

CLC Number:

S917.4

Li Peilun, Liu Wei, Wang Jilong, Gao Wenyan, Cui Kangcheng. Salinity and Juvenile Chum Salmon (Oncorhynchus keta): Effects on Liver Histomorphology, Non-specific Immune and Digestive Enzymes[J]. Chinese Agricultural Science Bulletin, 2020, 36(19): 145-151.

Figures/Tables 5

References 25

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